You were absolutly right mate thx alot !
I didnt know how to generate tangents but its very simple 
Thats the result and btw, why is the default renderer giving such beautiful results ? 
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Oh and happy new year to all out there 
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Im this case, it just means that the model and textures are good. You can see the difference between good textures if you compare the rocky wall with your model. On the rock you cannot even say for sure lighting is used.
Just from the scene and recognizing that it’s probably a simple setup… I would assume that lighting was NOT used based on those visuals.